Originally Posted by
w98seeng
I'm running a 9 speed cassette now so someone must have changed the freehub sometime in the past.
Then IMO your 600 hub may as well be Ultegra. It's just what they started calling 600 (there was even "600 Ultegra" for a bit IIRC), and I doubt any changes were made to rear hubs at that time besides 130mm and Hyperglide cassette bodies beyond changing the name.